I tried to keep the statistics of this champion as balanced as possible, referring to the statistics in League of Legends itself.
The original Tahm Kench champion is the weakest but he's getting stronger when transforming into his other skin in exchange for gold and favor.
I gave all of these champions a special attack based on the idea of a attack in the game itself. It's not exactly the same due to the limited engine in AoM but you will enjoy it!
Tahm Kench:
Tahm Kench (Master Chef):
Tahm Kench (Urf):

Special Attack: Swallow. Picks up human soldiers and villagers with his tongue, swallows them and kills them instantly.

This special attack is based on an unused proto action namely: "Swallow"
I thought it fit well with his animation.

Put all the files in the corresponding folders.
Then you should be good to go!